import 'package:flutter/material.dart';
import 'package:srg_flutter_demo/listviewdemo.dart';
import 'dart:async';
import 'package:shared_preferences/shared_preferences.dart';
void main() => runApp(App());


class App extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Home();
  }

}



class Home extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return  MaterialApp(
      debugShowCheckedModeBanner: false,
      title: "srg app",
      home: MainPage(),

      theme: ThemeData(
          primaryColor: Color(0xFF3dbec7),
          primarySwatch: Colors.blueGrey
      ),
    );
  }

}

class MainPage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    // TODO: implement createState
    return new MainStatePage();
  }

}

class MainStatePage  extends State<MainPage>{
  int _tabIndex=0;
  var tabImages;
  var appBarTitles=['首页','发现','我的'];
  var _pageList;

  Image getTabImage(path) {
    return new Image.asset(path, width: 24.0, height: 24.0);
  }

  Image getTabIcon(int curIndex) {
    if (curIndex == _tabIndex) {
      return tabImages[curIndex][1];
    }
    return tabImages[curIndex][0];
  }


  void initData() {
    /*
     * 初始化选中和未选中的icon
     */
    tabImages = [
      [getTabImage('images/ic_cangcu.png'), getTabImage('images/ic_pre_cangcu.png')],
      [getTabImage('images/ic_device.png'), getTabImage('images/ic_pre_device.png')],
      [getTabImage('images/ic_bingce.png'), getTabImage('images/ic_pre_bingce.png')]
      ,
      [getTabImage('images/ic_mine.png'), getTabImage('images/ic_pre_mine.png')]
    ];
    /*
     * 三个子界面
     */
    _pageList = [
      CangcuPage(),
      DeviceView(),
      WorkView(),
      PersonView(),
    ];
  }
  void _getsp() async{
    SharedPreferences preferences= await SharedPreferences.getInstance();
    preferences.setString("src", "dddd");
}

  @override
  Widget build(BuildContext context) {

    initData();
    // TODO: implement build
    return Scaffold(
        body: _pageList[_tabIndex],
          bottomNavigationBar: BottomNavigationBar(items: [
            BottomNavigationBarItem(icon: getTabIcon(0),title: Text("仓储")),
            BottomNavigationBarItem(icon: getTabIcon(1),title: Text("设备")),
            BottomNavigationBarItem(icon: getTabIcon(2),title: Text("冰点测量")),
            BottomNavigationBarItem(icon: getTabIcon(3),title: Text("我的")),

          ],
            type: BottomNavigationBarType.fixed,
            iconSize: 24.0,

            currentIndex: _tabIndex,
            onTap: (index){
                  setState(() {

                    _tabIndex=index;
                  });
            },

          ),
    );
  }
}

class DeviceView  extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(

      child: Text("device"),
    );
  }
}


class WorkView  extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return
       Scaffold(
         appBar: AppBar(title: Text("work",style: TextStyle(
           color: Colors.white
         ),),),
         body: Center(
           child: Text("work"),
         ),
       );


  }
}


class PersonView  extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(

      child: Text("person"),
    );
  }
}


class MainBottomBar extends StatefulWidget{
  @override
  State<StatefulWidget> createState() {
    // TODO: implement createState
    return BottomBar();
  }

}

class BottomBar extends State<MainBottomBar>{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return  BottomNavigationBar(
        type: BottomNavigationBarType.fixed,
        fixedColor: Colors.yellow,
        items: [
          BottomNavigationBarItem(icon: Icon(Icons.home),title: Text("home")),
          BottomNavigationBarItem(icon: Icon(Icons.devices),title: Text("device")),
          BottomNavigationBarItem(icon: Icon(Icons.work),title: Text("work")),
          BottomNavigationBarItem(icon: Icon(Icons.person),title: Text("person")),

        ]

    );
  }

}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        actions: <Widget>[
          new Center(

            child: new Text("app", textDirection: TextDirection.ltr,
              textAlign: TextAlign.center,
              style: TextStyle(
                  fontSize: 30.0,
                  fontWeight: FontWeight.w500

              ),),

          )
          ,

        ],
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme
                  .of(context)
                  .textTheme
                  .display1,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}
